Because some people, mostly Gray fans from my country, believe that Gray just destroyed it with a normal physical punch and only after this the Devil Slayer made the Ice magic with the same properties as the armor. In my vision, Gray made something similar to what he did to defeat Doriate and used the kamui ice through his body to be able to destroy the armor.
- What do you guys think about it?
I would say that your way of thinking is the right path. I agree that a normal punch would be an absurd explanation since Gray would've been frozen solid if he ever made direct contact with Invel's divine ice.
With that said, I think Gray breaking Invel's Ice-Rendering Divine Raiment armor has a
two-part explanation to it:
Part 1:
First, Gray has to prevent himself from being frozen by Invel's divine ice before he can do anything else. As Invel stated during their fight, his Divine Ice Raiment armor has the power to freeze
anything it touches, which even includes
neglecting his opponent's resistance to ice.
This is precisely the reason why Gray had to cover his hand in ice before he punched Invel. (In these 2 panels:
[1] [2] - Notice the ice around his arm when he punches).
The layer of ice around Gray's fist acted as a buffer zone to give Gray enough time to channel the divine ice through his body and convert it into his own form of ice magic. Without it, Gray would've been frozen immediately upon contact with Invel's armor, just as it had been stated.
Ultimately, Gray channeling the divine ice through his body and and integrating it into his own magic
is what prevented him from being frozen permanently by Invel's ice armor.
Part 2:
Once Gray gained control of Invel's divine ice, he also had the ability to combine it with his Ice-Make Magic and Ice Devil Slaying Magic to break Invel's Raiment armor.
This part of the battle didn't strike me as anything new since it had already been shown numerous times in the past that Ice Wizards are capable of breaking their opponent's ice.
As far as I'm concerned, the durability of Invel's Raiment armor
wasn't any different from regular ice that we've seen in the past.
The only special property that the armor had was that it could freeze anything that it touches, which was the bigger concern for me in that battle.
If Gray could overcome being frozen by Invel's divine ice (which seems pretty clear-cut to me), I see no reason why the entire battle wouldn't make sense.